Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9f3f149debdce6fa8e2f4c4f397cd02c2eaf3d61cd9abfbd533804386d8eaf' 
  AND token = '2uV332qIFytr0gDtPZTILy3L/9tQ9zngeTCjGmIkbzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}